Emery grinding-machine.



PATENTBD MAR. 5, 1907.

IvI. MAGHAGEK. NMENY @BINDING MACHINE.

APPLIOATION FILED APB..26.14906.

MIKE MACHACEK, OF NEW PRAGUE, MINNESOTA.

EIVIERY GRINDINGIVIACHINE.

Specification of Letters Patent.

Patented March 5, 1907.

Application led April 26,1906. Serial No. 313,783.

T0 (LN, whom t may concern:

Be it known that I, MIKE MACHACEK, a

citizen of the United States, residing at New ,I

My invention relate to emery grinding-ma-` chines or emery grinders, especially those of the type employ ing two grinding-wheels, one at each end of a mandrel or arbor; and the object of the invention is to provide means for automatically compensating for the wear of parts on the mandrel in frictional contact with one another, and thereby prevent looseness of such parts in operation. This object I accomplish by interposing a slip-collar and spring between one of the journal-boxes and the adjacent wheel-holder.

My improvements are illustrated in the accompanying drawings, in which- Figure l is a side elevation, partly sectional, showing a double emery grindingmachine provided with my improvement. Fig. 2 is an enlarged view of the right-hand portion of Fig. l, the slip-collar and spring being shown in operative positions and Fig. 3 shows the same parts as Fig. 2, but with. the spring expanded and the collar free from contact with the emery-wheel holder.

In the drawings, l designates the stand, on the arms 2 of which the journal-boxes 3 and 4 for the mandrel 5 are mounted. The emery-wheels 6 are held between flanges or clamp members 7 and 8, secured to the mandrel in the usual way.

To take up the Wear of parts, Iinterpose between the hub 9 of one of the clamp members 7 and the adjacent journal-box a slip-collar 10 and a coil-spring 11. Preferably I employ a hollow collar and place the spring within rather than around the collar. To

. connect the collar to the-hub 9, the latter is the spring-pressure parallel with the mandrel. It is desirable to interpose a loose collar 14 between the j ournal-boX 3 and the slip-collar 10 and between the journal-box 4 and the adjacent flange-hub 9. By this construction any looseness of parts caused by friction will be obviated by the pressure of the spring 11 against the hub 9 and slip-collar 10.

Having described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a machine of the class described, the combination with the mandrel, of a slip-collar thereon, a 'liXed abutment, and a spring for exerting pressure against such collar and abutment, for the purpose set forth.

2. In a machine of the class described, the combination with one of the members of the wheel-clamp, of a slip-collar and a spring eX- erting pressure against such clamp member and slip-collar, for the purpose set forth.

3. In a machine of the class described, the combination with the mandrel, its journalbox, and a member ofthe wheel-clamp, of an intervening slip-collar and spring, for the purpose set forth.

4. In a machine of the class described, the combination with the mandrel, its journalbox, a loose collar adjacent to the boX, and a member of the wheel-clamp, of a slip-collar interposed between the latter and the loose collar, for the purpose set forth.

5. In a machine of the class described, having a single mandrel and two'grindingwheels, and journal-boxes intermediate the wheels, of loose collars adjacent to the outer edges ofthe boxes, and a slip-collar and coilspring interposed between one of said loose collars and the adjacent wheel-clamp, substantially as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 20th day of April, 1906.

MIKE MACHACEK. litnessest MICHAEL SCHIEMER, HENRY DEUTSCH. 

